Citations
Every claim in a Nexus answer traces back to a real, retrieved passage — not a paraphrase, and not something the model asserted unverified.
Shape
Each message that streams back carries a structured citations array alongside its text. A citation is never just a footnote number — it resolves to the actual document and passage:
{
"refId": "1",
"chunkId": "chk_01h...",
"documentId": "doc_01h...",
"pageNumber": 14,
"quote": "Refunds are issued within 5 business days of..."
}
How a citation earns its place
The model is instructed to cite the reference id of any retrieved chunk it draws on, inline, as it generates. That's a claim, not a guarantee — so after generation completes, every citation marker in the output is checked against the chunk IDs that were actually included in context for that request. Anything that doesn't resolve is stripped before the response is considered final. A citation you see in a Nexus answer is one the system independently confirmed, not one the model merely asserted.
In the UI
Citation markers render inline as small numbered badges; hovering or clicking one opens the exact quoted passage plus a page reference, so "trust me" is never the only option a reader has.